Abstract

SANCHEZ, Esteban et al. Are photosynthetic pigments good indicators of the nitrogen-phosphorus- potassium nutritional State in beans?. Ecosistemas y recur. agropecuarios [online]. 2018, vol.5, n.15, pp.387-398. ISSN 2007-901X.  https://doi.org/10.19136/era.a5n15.1757.

The objective was to determine whether leaf pigments are good indicators of the nutrient status of N, P and K in bean plants. Three independent studies were conducted; in the first, N was applied to the nutrient solution in the form of NH4N03 in increasing doses from 0 to 24.0 mM N. In the second experiment, P was applied in H3P04 form in increasing doses from 0 to 8.0 mM P, and in the third experiment, K was applied in KS04 form in increasing doses from 0 to 16.0 mM K. The parameters analyzed in leaf tissue were: concentration of N, P and K, biomass, concentration of foliar pigments and their ratios. The results indícate that N application favored the accumulation of chlorophyll a, b and carotenes, presenting the maximum concentration at the 18 mM dose; in the same way, the P application favored the accumulation of pigments, with the 4.0 mM dose having the greatest accumulation, while the K application exhibited an inverse behavior to N and P, having the highest accumulation of pigments with the 1.0 mM dose. The concentration of chlorophyll a, b and total had a positive and significant correlation with N nutrient status. The polynomial mathematical models could be an instrument for decision making for sustainable nutrient management of N, P and K fertilization.

Keywords : Phaseolus vulgaris L.; nutrient management; fertilization; deficiency; beans; toxicity.

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